Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = μ cp/k

RN = V²/t.cp

RN = ρ V l /μ

RN = hl/k

RN = μ cp/k

RN = V²/t.cp

RN = ρ V l /μ

RN = hl/k

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Heat and Mass Transfer
Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

One

Three

Two

Four

One

Three

Two

Four

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Heat and Mass Transfer
Fouling factor is used

In case of Newtonian fluids

When a liquid exchanges heat with a gas

None of these

In heat exchanger design as a safety factor

In case of Newtonian fluids

When a liquid exchanges heat with a gas

None of these

In heat exchanger design as a safety factor

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Heat and Mass Transfer
The transfer of heat by molecular collision is smallest in

Gases

Solids

None of these

Liquids

Gases

Solids

None of these

Liquids

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Heat and Mass Transfer
Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

P= 1, T = 0 and a = 0

P = 0, x = 0 and a = 1

P = 0, x = 1 and a = 0

X = 0, a + p = 0

P= 1, T = 0 and a = 0

P = 0, x = 0 and a = 1

P = 0, x = 1 and a = 0

X = 0, a + p = 0

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Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.02

0.1

0.002

0.01

0.02

0.1

0.002

0.01

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Heat and Mass Transfer

Heat and Mass Transfer Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer Fouling factor is used

Heat and Mass Transfer The transfer of heat by molecular collision is smallest in

Heat and Mass Transfer Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

Heat and Mass Transfer Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer
Fouling factor is used

Heat and Mass Transfer
The transfer of heat by molecular collision is smallest in

Heat and Mass Transfer
Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of